CN115190459A

CN115190459A - Method performed by user equipment and user equipment

Info

Publication number: CN115190459A
Application number: CN202110359016.1A
Authority: CN
Inventors: 赵毅男; 罗超; 刘仁茂
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2021-04-01
Filing date: 2021-04-01
Publication date: 2022-10-14
Also published as: US20240196417A1; EP4319221A1; WO2022206817A1

Abstract

The invention provides a method executed by user equipment and the user equipment, wherein the method comprises the following steps: the method comprises the steps that a request for determining transmission resources of the PSSCH/PSCCH is received from a high layer, the user equipment determines the active period of discontinuous reception of the sidestream communication, and the user equipment determines the set of monitoring time slots.

Description

Method performed by user equipment and user equipment

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a method performed by a user equipment and a corresponding user equipment.

Background

In a conventional cellular network, all communications must pass through the base station. In contrast, device-to-Device communication (Device-to-Device communication) refers to a communication method in which two user equipments directly communicate with each other without forwarding through a base station or a core network. A research topic on implementing an approaching D2D communication service with LTE devices was approved at RAN #63 congress of 3rd Generation Partnership project (3 gpp) in 2014, 3 month (see non-patent document 1). The functions introduced by LTE Release 12 d include:

1) Discovery function (Discovery) between adjacent devices in an LTE network coverage scenario;

2) A direct Broadcast communication (Broadcast) function between neighboring devices;

3) The higher layer supports Unicast (Unicast) and multicast (Groupcast) communication functions.

The research project of enhanced LTE eD2D (enhanced D2D) was approved at the 3gpp ran #66 congress of 12 months in 2014 (see non-patent document 2). The main functions introduced by LTE Release 13 ed2d include:

1) D2D discovery of non-network coverage scenarios and partial network coverage scenarios;

2) Priority handling mechanism for D2D communication.

Based on the design of the D2D communication mechanism, the V2X feasibility study topic based on D2D communication was approved in the 3GPP RAN #68 congress of 6 months in 2015. V2X represents Vehicle to evolution, and the Vehicle and all entity information interaction which possibly influences the Vehicle are expected to be realized, so that accidents are reduced, traffic jam is relieved, environmental pollution is reduced, and other information services are provided. The application scenario of V2X mainly includes 4 aspects:

1) V2V, vehicle to Vehicle, i.e. Vehicle-to-Vehicle communication;

2) V2P, vehicle to peer, i.e. the Vehicle sends a warning to pedestrians or non-motor vehicles;

3) V2N, vehicle to Network, i.e. Vehicle connected mobile Network;

4) V2I, vehicle to Infrastructure, i.e. the Vehicle communicates with road Infrastructure etc.

The 3GPP has divided the study and standardization work of V2X into 3 stages. The first stage is completed in 2016, 9 months, mainly focusing on V2V, and is formulated based on LTE Release 12 and Release 13 d2d (also called sidelink communication), i.e., proximity communication technology (see non-patent document 3). V2X stage 1 introduced a new D2D communication interface, called PC5 interface. The PC5 interface is mainly used for solving the problem of cellular internet of vehicles communication in high-speed (up to 250 km/h) and high-node density environments. The vehicles can interact with information such as position, speed and direction through the PC5 interface, i.e. the vehicles can communicate directly with each other through the PC5 interface. Compared with proximity communication between D2D devices, the functions introduced by LTE Release 14 V2X mainly include:

1) Higher density DMRS to support high speed scenarios;

2) Introducing a sub-channel (sub-channel) to enhance a resource allocation mode;

3) A user equipment aware (sensing) mechanism with semi-persistent scheduling (semi-persistent) is introduced.

The second stage of the V2X research topic falls under the LTE Release 15 research category (see non-patent document 4), and the introduced main characteristics include high-order 64QAM modulation, V2X carrier aggregation, short TTI transmission, and also include feasibility research of transmit diversity.

At the 6 th and 6 th 3gpp ran #80 congress in 2018, the corresponding third stage was approved based on the V2X feasibility study topic of 5G NR network technology (see non-patent document 5).

In the 5G NR V2X topic, a resource allocation mode 2 (resource allocation mode 2) based on user equipment sensing (sending) is supported, or referred to as transmission mode 2. In resource allocation mode 2, the physical layer of the ue senses the transmission resources in the resource pool and reports the set of available transmission resources to the upper layer. The upper layer selects resources specifically for sidelink communication transmission after obtaining the report of the physical layer.

On the full meeting of 3gpp ran #90e at 12 th 2020, the standardization study subject (see non-patent document 6) based on the NR sidelink enhancement (NR sidelink enhancement) that has been standardized has been approved. The enhancement of the sideline communication comprises the following two aspects:

1) Resource allocation for standardized reduction of power consumption (power saving) of a communication user equipment includes, but is not limited to: a resource allocation mode based on partial sensing and a resource allocation mode based on random resource selection;

2) Research is carried out to improve the communication reliability of the resource allocation mode 2 in NR-side communication and reduce the communication time delay of the resource allocation mode 2.

The scheme of the patent comprises a method for determining a candidate resource set in a resource allocation mode based on partial perception by a user equipment for sidestream communication in the sidestream communication enhancement, and a method for determining the time when an upper layer triggers a physical layer to perform partial perception by the user equipment.

The research subject of NR side-line communication enhancement also includes standardization research work for side-line communication Discontinuous Reception (SL DRX for short). In 5GNR communication, the ue supports discontinuous reception of the PDCCH, referred to as DRX, over time, which is effective to reduce power consumption of the communication device. Similarly, corresponding to SL DRX, discontinuous reception refers to receiving the physical sidelink communication control channel PSCCH for a portion of time in the time domain, referred to as the Active time (Active time); the time when the PSCCH is not received is called an inactive period (In-active time).

The solution of the patent also includes a method for the sideline communication user equipment to determine the duration of the round trip timer RTT timer.

Documents of the prior art

Non-patent document

Non-patent document 1: RP-140518, work item deployment on LTE Device to Device deployment Services

Non-patent document 2: RP-142311, work Item Proposal for Enhanced LTE Device to Device Proximity Services

Non-patent document 3: RP-152293, new WI propofol: support for V2V services based on LTE sidelink

Non-patent document 4: RP-170798, new WID on 3GPP V2X Phase 2

Non-patent document 5: RP-181480, new SID Proposal: study on NR V2X

Non-patent document 6: RP-202846, WID vision: NR sidelink enhancement

Disclosure of Invention

The invention aims to provide a method executed by user equipment and the user equipment, which can ensure that PSSCH transmitted by user equipment for sidestream communication can be received by opposite user equipment in an active period and enhance reliability of sidestream communication.

Another objective of the present invention is to provide a method executed by a ue and the ue, wherein in a resource allocation manner based on partial sensing, the scheme of the present invention can ensure that the ue can continuously monitor PSCCH after triggering partial sensing to avoid resource collision, thereby improving transmission reliability of sidelink communication.

It is still another object of the present invention to provide a method for a user equipment to determine a round trip timer, which is performed by the user equipment and is capable of effectively reducing power consumption of a user equipment for sidelink communication by ensuring consistency of the round trip timer between a transmitting user equipment and a receiving user equipment.

To address at least some of the above issues, the present invention provides a method performed by a user equipment and a user equipment.

According to a first aspect of the invention, a request is received from a higher layer to determine transmission resources for a psch/PSCCH, the user equipment determines an active period for discontinuous reception of sidestream communications, and the user equipment determines a set of listening slots.

According to the method performed by the user equipment of the first aspect of the invention, a request to determine the transmission resources of the psch/PSCCH is received from a higher layer over a time slot n.

According to the method performed by the user equipment of the first aspect of the present invention, the listening slot set comprises at least slots in all or part of the resource pool both in a time interval and in the active period, wherein the time interval is [ n, n + T ] _B ]Or [ n +1, n + T + _B ]Said T is _B Is the time slot in the 31 st of said resource pools starting from said time slot n, or, on the basis thereof, is forwarded or subtracted

Or

A time slot, or, the T _B Is the time slot in the 32 th said resource pool starting from said time slot n, or, on the basis thereof, is forwarded or subtracted

Or

One slot).

The method performed by the user equipment according to the first aspect of the present invention, a time interval being within the active period, wherein the time interval is [ n, n + T ] _B ]Or, [ n +1, n + T + _B ]Said T is _B Is the time slot in the 31 st of said resource pools starting from said time slot n, or, on the basis thereof, is forwarded or subtracted

Or

Or

One slot).

According to a second aspect of the invention, comprising: the first user equipment receives time interval indication information sent by the second user equipment, and the first user equipment determines the duration of a round trip timer of discontinuous reception of the sidestream communication.

According to the method performed by the user equipment of the second aspect of the present invention, the time interval indicated by the time interval indication information represents the time required for the second user equipment to determine the PSFCH reception processing and retransmission preparation.

According to the method performed by the user equipment of the second aspect of the present invention, the first user equipment determines the duration of the round trip timer for discontinuous reception of the sidestream communication according to at least the time interval indication information.

According to a third aspect of the invention, comprising: the user equipment acquires the configuration information of the sidestream communication resource pool, and the receiving user equipment determines the time length of a round trip timer for discontinuous reception of sidestream communication.

According to the method performed by the user equipment of the third aspect of the present invention, the configuration information of the sidestream communication resource pool at least includes a minimum time domain interval sl-MinTimeGapPSFCH between the psch and the PSFCH, and a Period sl-PSFCH-Period of the PSFCH.

The user equipment according to the fourth aspect of the present invention comprises: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, perform the method of the first aspect.

Effects of the invention

According to the scheme of the patent, in a resource allocation mode based on partial perception, PSSCH transmitted by user equipment for sidestream communication can be guaranteed to be received by opposite end user equipment in active time, and reliability of sidestream communication is enhanced; meanwhile, in a resource allocation mode based on partial sensing, the scheme of the patent can ensure that after partial sensing is triggered, the user equipment can continuously monitor the PSCCH to avoid resource conflict, and the transmission reliability of sidestream communication is improved; the method for determining the round trip timer RTT timer by the user equipment in the patent ensures the consistency of the round trip timer RTT timer between the sending user equipment and the receiving user equipment, and can effectively reduce the power consumption of the user equipment for sidestream communication.

Drawings

The above and other features of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:

fig. 1 is a schematic diagram illustrating LTE V2X UE sidelink communications.

Fig. 2 is a diagram illustrating a resource allocation scheme of LTE V2X.

Fig. 3 is a diagram illustrating a basic procedure of a method performed by a user equipment in the first embodiment of the invention.

Fig. 4 is a schematic diagram showing a basic procedure of the method performed by the user equipment in the second and third embodiments of the present invention.

Fig. 5 is a diagram illustrating a basic procedure of a method performed by a user equipment in the fourth embodiment of the present invention.

Fig. 6 is a schematic diagram showing a basic procedure of the method performed by the user equipment in the fifth embodiment of the present invention.

Fig. 7 is a schematic diagram showing a basic procedure of the method performed by the user equipment in the sixth and seventh embodiments of the invention.

Fig. 8 is a block diagram illustrating a user equipment according to an embodiment of the present invention.

Detailed Description

The invention is described in detail below with reference to the drawings and the detailed description. It should be noted that the present invention should not be limited to the specific embodiments described below. In addition, for the sake of brevity, detailed descriptions of well-known technologies not directly related to the present invention are omitted to prevent confusion of understanding of the present invention.

Embodiments according to the present invention are described in detail below with a 5G mobile communication system and its subsequent evolution as an example application environment. However, it should be noted that the present invention is not limited to the following embodiments, but is applicable to more other wireless communication systems, such as a communication system after 5G and a 4G mobile communication system before 5G.

Some terms to which the present invention relates will be described below, and the terms to which the present invention relates are defined herein, unless otherwise specified. The terms given in the invention may adopt different naming manners in LTE, LTE-Advanced Pro, NR and the following communication systems, but the unified terms adopted in the invention can be replaced by the terms adopted in the corresponding systems when being applied to the specific systems.

3GPP:3rd Generation partnershift Project, third Generation Partnership Project

LTE: long Term Evolution, long Term Evolution technology

NR: new Radio, new Wireless, new air interface

PDCCH: physical Downlink Control Channel, physical Downlink Control Channel

DCI: downlink Control Information, downlink Control Information

PDSCH: physical Downlink Shared Channel (pdcch)

UE: user Equipment, user Equipment

eNB: evolved NodeB, evolved node B

And g NB: NR base station

TTI: transmission Time Interval, transmission Time Interval

OFDM: orthogonal Frequency Division Multiplexing, orthogonal Frequency Division Multiplexing

CP-OFDM: cyclic Prefix Orthogonal Frequency Division Multiplexing with Cyclic Prefix

C-RNTI: cell Radio Network Temporary Identifier

CSI: channel State Information, channel State Information

HARQ: hybrid Automatic Repeat Request (HARQ)

CSI-RS: channel State Information Reference Signal (CSI-RS)

CRS: cell Reference Signal, cell specific Reference Signal

PUCCH: physical Uplink Control Channel, physical Uplink Control Channel

PUSCH: physical Uplink Shared Channel (PRCH)

UL-SCH: uplink Shared Channel, uplink Shared Channel

CG: configured Grant, configure scheduling Grant

Sidelink: sidelink communications

SCI: sidelink Control Information, sidelink communication Control Information

PSCCH: physical Sidelink Control Channel, physical Sidelink communication Control Channel

MCS: modulation and Coding Scheme, modulation and Coding Scheme

RB: resource Block, resource Block

RE: resource Element, resource Element

CRB: common Resource Block, common Resource Block

And (3) CP: cyclic Prefix, cyclic Prefix

PRB: physical Resource Block, physical Resource Block

PSSCH: physical Sidelink Shared Channel, a Physical Sidelink Shared Channel

FDM: frequency Division Multiplexing, frequency Division Multiplexing

RRC: radio Resource Control, radio Resource Control

RSRP: reference Signal Receiving Power, reference Signal Receiving Power

SRS: sounding Reference Signal

DMRS: demodulation Reference Signal

CRC: cyclic Redundancy Check (CRC)

PSDCH: physical Sidelink Discovery Channel

PSBCH: physical Sidelink Broadcast Channel, physical Sidelink communication Broadcast Channel

SFI: slot Format Indication

TDD: time Division Duplexing

FDD: frequency Division Duplexing

SIB1: system Information Block Type 1, system Information Block Type 1

SLSS: sidelink synchronization Signal, a side-line communication synchronization Signal

PSSS: primary Sidelink Synchronization Signal, sideline communication Primary Synchronization Signal

SSSS: secondary Sidelink Synchronization Signal, sideline communication auxiliary Synchronization Signal

PCI: physical Cell ID, physical Cell identity

PSS: primary Synchronization Signal, primary Synchronization Signal

SSS: secondary Synchronization Signal, secondary Synchronization Signal

BWP: bandwidth Part, bandWidth fragment/Part

GNSS: global Navigation Satellite positioning System (GNSS)

SFN: system Frame Number, system (radio) Frame Number

DFN: direct Frame Number, direct Frame Number

IE: information Element, information Element

And (3) SSB: synchronization Signal Block, synchronous System information Block

EN-DC: EUTRA-NR Dual Connection, LTE-NR Dual connectivity

And (3) MCG: master Cell Group, master Cell Group

SCG: secondary Cell Group, secondary Cell Group

PCell: primary Cell

SCell: secondary Cell, secondary Cell

PSFCH: physical Sidelink Feedback Channel, physical Sidelink communication Feedback Channel

SPS: semi-persistent Scheduling, semi-persistent Scheduling

TA: timing Advance, uplink Timing Advance

PT-RS: phase-Tracking Reference Signals

TB: transport Block

CB: code Block, code Block/Code Block

QPSK: quadrature Phase Shift Keying (QPSK)

16/64/256QAM:16/64/256 Quadrature Amplitude Modulation

AGC: auto Gain Control, automatic Gain Control

TDRA (field): time Domain Resource Assignment, time Domain Resource allocation indication (Domain)

FDRA (field): frequency Domain Resource Assignment, frequency Domain Resource allocation indication (Domain)

ARFCN: absolute Radio Frequency Channel Number, absolute Radio Frequency Channel Number

SC-FDMA: single Carrier-Frequency Division Multiple Access, single Carrier-Frequency Division Multiple Access

And MAC: medium Access Control, media Access Control layer

DRX: discontinuous Reception, discontinuous Reception

RTT: round Trip Time, round Trip Time

The following is a description of the prior art associated with the inventive arrangements. Unless otherwise specified, the same terms in the specific examples have the same meanings as in the prior art.

It is to be noted that V2X referred to in the description of the present invention has the same meaning as sidelink. V2X herein may also represent sidelink; similarly, sidelink herein may also refer to V2X, and is not specifically distinguished or limited hereinafter.

In the description of the present invention, the resource allocation method of V2X (sidelink) communication and the transmission mode of V2X (sidelink) communication may be equivalently replaced. The resource allocation referred to in the specification may indicate a transmission mode, and the transmission mode referred to may indicate a resource allocation. In NR side-line communication, transmission mode 1 indicates a transmission mode (resource allocation scheme) based on base station scheduling; transmission mode 2 denotes a transmission mode (resource allocation manner) based on user equipment awareness (sensing) and resource selection.

The PSCCH in the description of the present invention is used to carry SCI. The PSCCH referred to in the description of the present invention is referred to as corresponding PSCCH, or related PSCCH, or scheduled PSCCH, which all have the same meaning and all represent either an associated PSCCH or a associated PSCCH. Similarly, PSSCH references in the specification correspond to, or represent the same meaning as the related SCI (including the first-level SCI and the second-level SCI), which all refer to the associated SCI or the correlating SCI. It is worth pointing out that the first-level SCI, called 1st stage SCI or SCI format 1-A, is transmitted in PSCCH; the second-level SCI is called 2nd stage SCI or SCI format 2-A (or SCI format 2-B) and is transmitted in the resource of the corresponding PSSCH.

In the description of the present invention, the peer user equipment refers to a user equipment on the receiving side in unicast communication (unicast) of sidestream communication, that is, a receiving user equipment. Unicast communication means that a connection is established between one sending user equipment and one receiving user equipment, which is called a PC5 RRC connection. After establishing the PC5 RRC connection, the sending user equipment may send a configuration message of the PC5 RRC to the receiving user equipment (peer user equipment); the receiving user equipment may also send a configuration message of the PC5 RRC to the sending user equipment, which is not limited in the present invention. When the receiving user equipment sends a configuration message, or psch, or PSFCH, to the sending user equipment, the sending user equipment may also be referred to as a peer user equipment.

In the embodiments of the present disclosure, the listening slot set determined by the ue may not include the slot where the ue transmits (psch/PSCCH), which is not limited in this respect.

Scenarios for Sidelink communications

1) Out-of-Coverage (Out-of-Coverage) sidelink communication: neither UE performing sidelink communication has network coverage (e.g., the UE does not detect any cell satisfying the "cell selection criterion" on the frequency on which the sidelink communication is required, indicating that the UE has no network coverage).

2) Network Coverage (In-Coverage) side communication: both UEs performing sidelink communications have network coverage (e.g., the UE detects at least one cell satisfying the "cell selection criteria" on the frequency on which the sidelink communications are desired, indicating that the UE has network coverage).

3) Partial-network overlay (Partial-Coverage) sidelink communications: one of the UEs performing sidelink communication has no network coverage, and the other UE has network coverage.

From the UE side, the UE has only two scenarios, namely, network coverage and non-network coverage. Partial network coverage is described from the perspective of sidelink communications.

Basic procedure for LTE V2X (sidelink) communication

Fig. 1 is a schematic diagram illustrating LTE V2X UE sidelink communications. First, UE1 transmits sidelink communications control information (SCI format 1) to UE2, which is carried by the physical layer channel PSCCH. The SCI format 1 includes scheduling information of the PSSCH, for example, frequency domain resources of the PSSCH. Next, UE1 transmits sidelink communication data to UE2, which is carried by the physical layer channel pscch. The PSCCH and the corresponding PSCCH are frequency division multiplexed, that is, the PSCCH and the corresponding PSCCH are located on the same subframe in the time domain and are located on different RBs in the frequency domain. In LTE V2X, a transport block TB may contain only one initial transmission, or one initial transmission and one blind retransmission (indicating a retransmission not based on HARQ feedback).

The specific design modes of the PSCCH and the PSSCH are as follows:

1) The PSCCH occupies one subframe in the time domain and two consecutive RBs in the frequency domain. The initialization of the scrambling sequence takes a predefined value 510. The PSCCH may carry SCI format 1, where SCI format 1 at least includes frequency domain resource information of the PSCCH. For example, for the frequency domain resource indication field, SCI format 1 indicates the starting sub-channel number and the number of consecutive sub-channels of the pschs corresponding to the PSCCH.

2) The PSCCH occupies one subframe in the time domain, and the corresponding PSCCH employs Frequency Division Multiplexing (FDM). The PSSCH occupies one or more continuous sub-channels in the frequency domain, and the sub-channels represent n in the frequency domain _subCHsize A plurality of RB, n in succession _subCHsize Configured by RRC parameters, the number of starting sub-channels and consecutive sub-channels is indicated by the frequency domain resource indication field of SCIformat 1.

LTE V2X resource allocation Mode 3/4

Fig. 2 shows two resource allocation schemes of LTE V2X, which are respectively referred to as resource allocation based on base station scheduling (Transmission Mode 3) and resource allocation based on UE sensing (sensing) (Transmission Mode 4). In NR side-row communication, transmission mode 3 of LTE V2X corresponds to transmission mode 1 in NR V2X, which is a transmission mode based on base station scheduling; transmission mode 4 of LTE V2X corresponds to transmission mode 2 in NR V2X, which is a UE-aware based transmission mode. In LTE V2X, when there is eNB network coverage, a base station may configure a resource allocation manner of a UE, or referred to as a transmission mode of the UE, through UE-level dedicated RRC signaling (dedicated RRC signaling) SL-V2X-ConfigDedicated, specifically:

1) Resource allocation scheme (Transmission Mode 3) based on base station scheduling: the resource allocation method based on base station scheduling represents that the frequency domain resources used by sidelink communication are scheduled by the base station. The transmission mode 3 includes two scheduling modes, namely dynamic scheduling and semi-persistent scheduling (SPS). For dynamic scheduling, the UL grant (DCI format 5A) includes frequency domain resources of the pscch, and the CRC of the PDCCH or EPDCCH carrying the DCI format 5A is scrambled by the SL-V-RNTI. For SPS semi-persistent scheduling, the base station transmits via IE: the SPS-ConfigSL-rl4 configures one or more (up to 8) configured scheduling grants (configured grant), each configured scheduling grant containing a scheduling grant number (index) and a resource period of the scheduling grant. The UL grant (DCI format 5A) includes frequency domain resources of the psch, and indication information (3 bits) of a scheduling grant number and indication information of SPS activation (activation) or release (release or deactivation). The CRC of the PDCCH or EPDCCH carrying the DCI format 5A is scrambled by SL-SPS-V-RNTI.

Specifically, when the RRC signaling SL-V2X-ConfigDedicated is set to scheduled-r14, it indicates that the UE is configured to a transmission mode based on base station scheduling. The base station configures SL-V-RNTI or SL-SPS-V-RNTI through RRC signaling, and sends uplink scheduling permission UL grant to the UE through PDCCH or EPDCCH (DCI format 5A, CRC scrambling by adopting SL-V-RNTI or scrambling by adopting SL-SPS-V-RNTI). The uplink scheduling grant UL grant at least includes scheduling information of PSSCH frequency domain resources in sidelink communication. And when the UE successfully monitors PDCCH or EPDCCH scrambled by SL-V-RNTI or SL-SPS-V-RNTI, taking a PSSCH frequency domain resource indication domain in an uplink scheduling grant UL grant (DCI format 5A) as indication information of a PSSCH frequency domain resource in the PSCCH (SCI format 1), and sending the PSCCH (SCI format 1) and the corresponding PSSCH.

For semi-persistent scheduling SPS in transmission mode 3, the UE receives DCI format 5A scrambled by SL-SPS-V-RNTI on downlink subframe n. If the DCI format 5A contains indication information of SPS activation, the UE determines frequency domain resources of the PSSCH according to the indication information in the DCI format 5A, and determines time domain resources of the PSSCH (transmission sub-frame of the PSSCH) according to information such as sub-frame n and the like.

2) Resource allocation method based on UE sensing (sensing) (Transmission Mode 4): the resource allocation manner based on the UE sending represents a sensing (sending) process of the resource for sidelink communication based on the UE to the candidate available resource set. The RRC signaling SL-V2X-configured Dedicated is UE-Selected-r14, which indicates that the UE is configured to transmit mode based on UE sending. In a transmission mode based on UE sending, a base station configures an available transmission resource pool, and a UE determines a sidelink transmission resource of a PSCCH in the transmission resource pool (resource pool) according to a certain rule (for a detailed description of the procedure, see LTE V2X UE sending procedure), and transmits the PSCCH (SCI format 1) and the corresponding PSCCH.

Side communication resource pool (sidelink resource pool)

In the sidestream communication, the resources transmitted and received by the UE belong to a resource pool. For example, for a transmission mode based on base station scheduling in sidestream communication, the base station schedules transmission resources for sidelink UEs in the resource pool, or for a transmission mode based on UE perception in sidestream communication, the UE determines the transmission resources in the resource pool.

Resource allocation based on (partial) perception

For the resource allocation mode based on (partial) perception, the sidestream communication user equipment selects candidate resources in a time window, determines candidate resources overlapping with the reserved resources according to the reserved resources indicated by the PSCCH sent by other user equipment in the listening time slot, and excludes the candidate resources (excludes) overlapping with the reserved resources. And the physical layer reports the candidate resource set which is not excluded to the MAC layer, and the MAC layer selects transmission resources for PSSCH/PSCCH.

Physical sidelink communication feedback channel PSFCH

In the sidelink communication, the PSFCH is used to carry HARQ feedback (HARQ-ACK) for the sidelink communication. For example, the transmitting user equipment transmits the PSCCH and PSCCH, and the receiving user equipment feeds back ACK on the PSFCH if the PSCCH and PSCCH are correctly received and decoded; otherwise, NACK is fed back.

Parameter set (numerology) in NR (including NR sidelink) and in NR (including NR) sidelink) of Slot slot

Parameter set numerology includes both subcarrier spacing and cyclic prefix CP length implications. Where NR supports 5 subcarrier spacings, respectively 15k,30k,60k,120k,240khz (corresponding to μ =0,1,2,3,4), table 4.2-1 shows the supported set of transmission parameters, as shown below.

Table 4.2-1 NR Supported subcarrier spacing

μ	Δf＝2 ^μ ·15[kHz]	CP (Cyclic prefix)
			0	15	Is normal
1	30	Is normal
			2	60	Normal, extended
3	120	Is normal
			4	240	Is normal

Extended (Extended) CP is supported only when μ =2, i.e., in the case of 60kHz subcarrier spacing, and only normal CP is supported in the case of other subcarrier spacing. For Normal (Normal) CP, each slot (slot) contains 14 OFDM symbols; for extended CP, each slot contains 12 OFDM symbols. For μ =0, i.e. 15kHz subcarrier spacing, 1 slot =1ms; μ =1, i.e. 30kHz subcarrier spacing, 1 slot =0.5ms; μ =2, i.e. 60kHz subcarrier spacing, 1 slot =0.25ms, and so on.

NR and LTE have the same definition for a subframe (subframe), indicating 1ms. For a subcarrier spacing configuration μ, the slot number within 1 subframe (1 ms) may be represented as

In the range of 0 to

The slot number within 1 system frame (frame, duration 10 ms) can be expressed as

In the range of 0 to

Wherein,

and

the definition of the case at different subcarrier spacings μ is shown in the table below.

Table 4.3.2-1: the number of symbols contained in each slot, the number of slots contained in each system frame and the number of slots contained in each subframe during normal CP

Table 4.3.2-2: when CP is expanded (60 kHz), the number of symbols contained in each slot, the number of slots contained in each system frame, and the number of slots contained in each subframe

On the NR carriers, the numbered SFN of the system frame (or simply frame) ranges from 0 to 1023. The concept of a direct system frame number DFN is introduced in the sidelink communication, again with a number ranging from 0 to 1023, and the above statements on the relation between system frames and numerology are equally applicable to direct system frames, e.g. a direct system frame having a duration equal to 10ms, a direct system frame comprising 10 slot slots for a subcarrier spacing of 15kHz, etc. DFN is applied for timing on sidelink carriers.

Parameter set in LTE (including LTE V2X) and slot and subframe in LTE (including LTE V2X)

LTE supports only 15kHz subcarrier spacing. Extended (Extended) CP is supported in LTE, as is normal CP. The subframe duration is 1ms, and comprises two slot slots, and the duration of each slot is 0.5ms.

For Normal (Normal) CP, each subframe contains 14 OFDM symbols, and each slot in the subframe contains 7 OFDM symbols; for extended CP, each subframe contains 12 OFDM symbols, and each slot in the subframe contains 6 OFDM symbols.

Resource block RB, resource element RE and sub-channel

The resource block RB is defined as in the frequency domain

A continuous sub-carrier, e.g. for a sub-carrier of 15kHzThe wave spacing, RB, is 180kHz in the frequency domain. For subcarrier spacing 15kHz 2 ^μ The resource element RE represents 1 subcarrier in the frequency domain and 1 OFDM symbol in the time domain.

In the sidestream communication, the resource allocation of the psch takes a sub-channel as a basic unit, i.e. the psch transmission occupies one or more continuous sub-channels in the frequency domain. Wherein one subchannel represents a plurality of consecutive RBs in the frequency domain. The number of RBs included in one subchannel is configured by RRC configuration information of the resource pool.

SLDRX and round trip timer RTT timer for sidestream traffic discontinuous reception

For SL DRX, the user equipment for sidestream communication monitors (monitor) PSCCH in active time; in the inactive period in-active time, the user equipment does not need to monitor the PSCCH.

In SL DRX, the user equipment determines whether the current time is an active period or an inactive period by some timer (running or timeout). For the round trip timer RTT timer, it means that the ue considers that the peer ue does not send PSCCH to schedule retransmission or other sidelink communication transmission when the timer is running, so that the ue is in an inactive period and does not monitor PSCCH before the RTT timer expires. RTT timer generally represents the minimum duration that a user equipment assumes that the peer user equipment will not schedule a retransmission.

In the description of the present invention, the timer timeout means that the running time of the timer exceeds the duration of the timer, that is, the timer timeout (timer expires).

Resource selection window [ n + T1, n + T2]

In a sensing (or partially sensing) based resource allocation approach, the higher layer requests or triggers the physical layer to determine resources for psch/PSCCH transmission at time slot n. The resource selection window is defined as [ n + T1, n + T2 ]]I.e. the user equipment selects transmission resources within the window. Wherein T1 satisfies the condition

The choice of T1 depends on the implementation of the user equipment; the RRC configuration information comprises a configuration list sl-SelectionWindowList of a resource selection window, wherein the list corresponds to a given priority prio _TX The element of (priority of transmitting PSSCH) is denoted T _2min . If the T is _2min Less than the remaining packet delay budget (referred to as remaining PDB), then T2 satisfies the condition T _2min T2 ≦ remaining PDB, T2 selection depending on user equipment implementation; otherwise, T2 is set to remaining PDB.

Is defined as follows (. Mu.m) _SL A subcarrier spacing parameter indicative of sidelink communication, i.e. a subcarrier spacing of

)：

Table 8.1.4-2：

Value of (a)

Table 8.1.4-1：

Value of

Specific examples, embodiments, and the like according to the present invention will be described in detail below. As described above, the examples and embodiments described in the present disclosure are illustrative for easy understanding of the present invention, and do not limit the present invention.

[ example one ]

Fig. 3 is a diagram illustrating a basic procedure of a method performed by a user equipment according to a first embodiment of the present invention.

The method executed by the ue according to the first embodiment of the present invention is described in detail below with reference to the basic process diagram shown in fig. 3.

As shown in fig. 3, in the first embodiment of the present invention, the steps performed by the user equipment include:

at step S101, a request (request, or trigger) to determine the transmission resources of the psch/PSCCH is received from a higher layer (or upper layer).

Optionally, the higher layer requests the user equipment to determine transmission resources of the psch/PSCCH on a slot n.

Optionally, the higher layer (being the physical layer) provides parameters for the psch/PSCCH transmission.

Optionally, the parameter for the PSSCH/PSCCH transmission comprises at least the number L of sub-channels for PSSCH/PSCCH transmission _subCH 。

In step S102, the sidelink user equipment determines candidate resources (candidate resources).

Optionally, a single-slot candidate resource (candidate-slot resource) is defined as a slot in the resource pool

L of _subCH A set of consecutive subchannels; and, optionally, the user equipment considers (or, assumes, assign) at time interval [ n + T1, n + T2 ]]And/or any of the L in any slot included in the resource pool during the discontinuous reception active period (SL DRX active time) of the sidelink communication _subCH The sets of consecutive sub-channels each correspond to a single-slot candidate resource. Wherein T1 and T2 are both determined by the specific implementation of the user equipment, or [ n + T1, n + T2 ]]Representing a resource selection window.The present embodiment does not set any limit to this.

[ example two ]

Fig. 4 is a diagram showing a basic procedure of a method performed by a user equipment according to a second embodiment of the present invention.

Next, the method executed by the user equipment according to the second embodiment of the present invention is described in detail with reference to the basic process diagram shown in fig. 4.

As shown in fig. 4, in the second embodiment of the present invention, the steps performed by the user equipment include:

at step S201, a request (request, or trigger) to determine the transmission resources of the psch/PSCCH is received from a higher layer (or upper layer).

In step S202, the sidelink communication ue determines an active time of an active period of the SL DRX in discontinuous reception in sidelink communication.

In step S203, the sidestream user equipment determines a listening slot set.

Optionally, the listening slot set at least includes [ n, n + T ] _B ](or, [ n +1, n + T + _B ]) Time slots in all or part of the resource pools in the system; and, optionally, the time interval [ n, n + T ] _B ](or, [ n +1, n + T + _B ]) At least the following conditions are satisfied: [ n, n + T ] _B ](alternatively, [ n +1, n + T + _B ]) Within an active time of the SL DRX. Wherein, optionally, T _B For the slot in the 31 st of said resource pools starting from said slot n (or, alternatively, forward or subtracted on this basis)

Or

One time slot), or, the T _B For a time slot in the 32 th of said resource pool starting from said time slot n (or, alternatively, forward or subtracted on this basis)

Or

Time slots), n is a natural number.

[ third example ]

Fig. 4 is a diagram illustrating a basic procedure of a method performed by a user equipment according to a third embodiment of the present invention.

Next, the method executed by the user equipment according to the third embodiment of the present invention is described in detail with reference to the basic process diagram shown in fig. 4.

As shown in fig. 4, in a third embodiment of the present invention, the steps performed by the user equipment include:

Optionally, the higher layer requests the user equipment to determine the transmission resources of the psch/PSCCH on a slot n.

In step S202, optionally, the side communication ue determines an active time of the side communication discontinuous reception SL DRX.

In step S203, the sidestream user equipment determines a listening slot set.

Optionally, the listening slot set includes at least a time interval [ n, n + T ] at the same time _B ](alternatively, [ n +1, n + T + _B ]) And time slots in all or part of the resource pool within the active time of the SL DRX. Wherein, optionally, T _B For the slot in the 31 st of said resource pools starting from said slot n (or, alternatively, forward or subtracted on this basis)

Or

One time slot), or, the T _B For the time slot in the resource pool 32 th from the time slot n (or, alternatively, forward or subtract on this basis)

Or

One slot), n is a natural number.

[ example four ]

Fig. 5 is a diagram illustrating a basic procedure of a method performed by a user equipment according to a fourth embodiment of the present invention.

Next, a method executed by the user equipment according to the fourth embodiment of the present invention is described in detail with reference to the basic process diagram shown in fig. 5.

As shown in fig. 5, in the fourth embodiment of the present invention, the steps performed by the user equipment include:

in step S301, the first sidelink communication ue receives the time interval indication information sent by the second sidelink communication ue.

Wherein, optionally, the second user equipment sends the time interval indication information through PC5 RRC signaling or through SCI.

Optionally, the time interval indicated by the time interval indication information represents the time required for the second user equipment to determine the PSFCH reception processing and retransmission preparation (including channel multiplexing, transmission/reception switching, and reception/transmission switching).

Optionally, the time interval is determined by a specific implementation of the second side communication user equipment (up to UE instantiation).

Optionally, the communication between the first user equipment and the second user equipment is unicast communication.

In step S302, the first ue determines the duration of a round trip timer RTT timer of the sidelink discontinuous reception SL DRX.

Optionally, the duration of the round trip timer RTT timer is determined by at least the time interval, and/or a configured (or pre-configured) minimum time domain interval sl-MinTimeGapPSFCH between PSSCH and PSFCH, and/or a configured (or pre-configured) Period sl-PSFCH-Period of PSFCH.

[ example five ]

Fig. 6 is a diagram showing a basic procedure of a method performed by a user equipment according to a fifth embodiment of the present invention.

The method executed by the ue according to the fifth embodiment of the present invention is described in detail below with reference to the basic process diagram shown in fig. 6.

As shown in fig. 6, in a fifth embodiment of the present invention, the steps performed by the user equipment include:

in step S401, the sidestream communication user equipment acquires configuration information of the sidestream communication resource pool.

Optionally, the configuration information of the sidestream communication resource pool at least includes a minimum time domain interval sl-MinTimeGapPSFCH between the PSSCH and the PSFCH, and a Period sl-PSFCH-Period of the PSFCH.

In step S402, the receiving ue determines the duration of a round trip timer RTT timer of the sidelink discontinuous reception SL DRX.

Optionally, the duration of the round trip timer RTT timer is equal to the minimum of the time required by the user equipment for PSFCH reception processing, retransmission preparation (including channel multiplexing, transmission/reception switching, and reception/transmission switching), or the duration of the round trip timer RTT timer is equal to the sum of the minimum of the time required by the user equipment for PSFCH reception processing, retransmission preparation (including channel multiplexing, transmission/reception switching, and reception/transmission switching) and a time interval. The time interval is determined by at least a minimum time interval sl-MinTimeGapPSFCH between the PSSCH and the PSFCH, and a Period sl-PSFCH-Period of the PSFCH.

[ sixth example ]

Fig. 7 is a diagram showing a basic procedure of a method performed by a user equipment of embodiment six of the present invention.

Next, a method executed by the user equipment according to the sixth embodiment of the present invention is described in detail with reference to the basic process diagram shown in fig. 7.

As shown in fig. 7, in a sixth embodiment of the present invention, the steps performed by the user equipment include:

in step S501, a higher layer (or upper layer) requests (or triggers) the sidelink communication user equipment (physical layer) to determine the transmission resource of the PSCCH/PSCCH.

In step S502, the sidestream user equipment determines a set of candidate slots (candidate slots).

Optionally, the user equipment determines the candidate timeslot set in a manner that depends on an implementation of the user equipment (up to UE initialization).

In step S503, the sidestream user equipment determines the monitored timeslot set.

Alternatively, if in time slot

Or time slot

Or time slot

If the time of the previous 31 or 32 resource pool timeslots is later than or equal to the timeslot n, then the listening timeslot set of the ue listening (or monitor) at least includes timeslots

Or time slot

Or time slot

All or part of the time slots in the resource pool coinciding with 31 or 32 preceding resource pool time slots and/or a sidelink communication discontinuous reception active period SL DRX active time; alternatively, if in time slot

Or time slot

Or time slot

The time of the previous 31 or 32 resource pool slots is earlier than the slot n, then the listening slot set of the ue listening (or monitor) at least includes slots

Or time slot

Or time slot

And all or part of the time slots in the resource pool which are coincided with the time slots n and/or the side communication discontinuous reception active period SL DRX active time. Wherein,

is any one of the set of candidate time slots,for example, first and last, the present invention is not limited in this regard.

[ seventh example ]

Fig. 7 is a diagram illustrating a basic procedure of a method performed by a user equipment according to a seventh embodiment of the present invention.

The method performed by the user equipment according to the seventh embodiment of the present invention is described in detail below with reference to the basic process diagram shown in fig. 7.

As shown in fig. 7, in a seventh embodiment of the present invention, the steps performed by the user equipment include:

In step S502, the sidestream user equipment determines a set of candidate timeslots (candidate slots).

In step S503, the sidestream user equipment determines a monitored timeslot set.

Alternatively, if in time slot

Or time slot

Or time slot

The time of the previous 31 or 32 resource pool time slots is later than or equal to the time slot n, then the time slot

Or time slot

Or time slot

Time slots in all or part of resource pools from 31 forward resource pool time slots to 32 forward resource pool time slots belong to an active period SL DRX active time for discontinuous reception of lateral communication; alternatively, if in time slot

Or time slot

Or time slot

The time of the first 31 or 32 resource pool slots is earlier than the time slot n, then the time slot

Or time slot

Or time slot

And all or part of the time slots in the resource pool between the time slot n belong to an active period SL DRX active time of discontinuous reception of sidelink communication. Wherein,

is any time slot in the candidate time slot set, for example, the first time slot and the last time slot, which is not limited in this respect.

Fig. 8 is a block diagram showing a user equipment UE according to the present invention. As shown in fig. 8, the user equipment UE80 includes a processor 801 and a memory 802. The processor 801 may include, for example, a microprocessor, microcontroller, embedded processor, or the like. The memory 802 may include, for example, volatile memory (e.g., random access memory RAM), a Hard Disk Drive (HDD), non-volatile memory (e.g., flash memory), or other memory, among others. The memory 802 has stored thereon program instructions. Which when executed by the processor 801 may perform the above-described method performed by the user equipment as described in detail herein.

The method of the invention and the apparatus involved have been described above in connection with preferred embodiments. It will be appreciated by those skilled in the art that the methods shown above are merely exemplary and that the various embodiments described above can be combined with each other without contradiction. The method of the present invention is not limited to the steps or sequence shown above. The network nodes and user equipment shown above may comprise further modules, e.g. modules that may be developed or developed in the future, which may be available to a base station, MME, or UE, etc. The various identifiers shown above are exemplary only and not limiting, and the invention is not limited to the specific information elements that are examples of these identifiers. Many variations and modifications may occur to those skilled in the art in light of the teachings of the illustrated embodiments.

It should be understood that the above-described embodiments of the present invention can be implemented by software, hardware, or a combination of both software and hardware. For example, various components within the base station and the user equipment in the above embodiments may be implemented by various means, including but not limited to: analog circuit devices, digital Signal Processing (DSP) circuits, programmable processors, application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs), programmable logic devices (CPLDs), and the like.

In this application, a "base station" may refer to a mobile communication data and control switching center with a large transmission power and a wide coverage area, and includes functions of resource allocation scheduling, data receiving and transmitting, and the like. "user equipment" may refer to a user mobile terminal, including, for example, a mobile phone, a notebook, etc., which may wirelessly communicate with a base station or a micro base station.

Furthermore, embodiments of the invention disclosed herein may be implemented on a computer program product. More specifically, the computer program product is one of the following: there is a computer readable medium having computer program logic encoded thereon that, when executed on a computing device, provides related operations for implementing the above-described aspects of the present invention. The computer program logic, when executed on at least one processor of a computing system, causes the processor to perform the operations (methods) described in embodiments of the present invention. Such arrangements of the invention are typically provided as downloadable software images, shared databases, etc. arranged or encoded in software, code and/or other data structures on a computer readable medium such as an optical medium (e.g., CD-ROM), floppy or hard disk or other medium such as firmware or microcode on one or more ROM or RAM or PROM chips or in one or more modules. The software or firmware or such configurations may be installed on a computing device to cause one or more processors in the computing device to perform the techniques described in embodiments of the present invention.

Further, each functional block or respective feature of the base station device and the terminal device used in each of the above embodiments may be implemented or executed by a circuit, which is typically one or more integrated circuits. Circuitry designed to perform the various functions described in this specification may include a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC) or a general purpose integrated circuit, a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, or discrete hardware components, or any combination thereof. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The general-purpose processor or each circuit described above may be configured by a digital circuit, or may be configured by a logic circuit. Further, when advanced technology capable of replacing the current integrated circuit is developed due to the advancement of semiconductor technology, the present invention can also use the integrated circuit obtained by the advanced technology.

Although the present invention has been described in conjunction with the preferred embodiments thereof, it will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention. Accordingly, the present invention should not be limited by the above-described embodiments, but should be defined by the appended claims and their equivalents.

Claims

1. A method performed by a User Equipment (UE), comprising:

receiving a request from a higher layer to determine transmission resources of the PSSCH/PSCCH,

the user equipment determines an active period of discontinuous reception of sidestream communication,

the user equipment determines a set of listening slots.

2. The method performed by the user equipment of claim 1, further comprising,

a request is received from a higher layer over time slot n to determine the transmission resources of the psch/PSCCH.

3. The method performed by a user equipment of claim 1,

the set of listening slots comprises at least slots in all or part of the resource pool both in a time interval and in the active period,

wherein the time interval is [ n, n + T ] _B ]Or [ n +1, n + T + _B ]，

Said T is _B Is the time slot in the 31 st of said resource pools starting from said time slot n, or, on the basis thereof, is forwarded or subtracted

Or

Or

One slot).

4. The method performed by a user equipment according to claim 1,

a time interval within the active period, wherein the time interval is [ n, n + T ] _B ]Or [ n +1, n + T + _B ]，

The T is _B Is the time slot in the 31 st of said resource pools starting from said time slot n, or, on the basis thereof, is forwarded or subtracted

Or

A time slot, or, the T _B Is the time slot in the 32 th said resource pool starting from said time slot n, or, is forwarded or subtracted on the basis thereof

Or

One slot).

5. A method performed by a User Equipment (UE), comprising:

the first user equipment receives the time interval indication information sent by the second user equipment,

the first user equipment determines the duration of a round trip timer for discontinuous reception of sidestream communications.

6. The method performed by a user equipment according to claim 5,

the time interval indicated by the time interval indication information represents the time required for receiving, processing and retransmission preparation of the PSFCH determined by the second user equipment.

7. The method performed by a user equipment according to claim 5,

and the first user equipment determines the duration of a round trip timer of discontinuous reception of the sidestream communication according to at least the time interval indication information.

8. A method performed by a User Equipment (UE), comprising:

the user equipment obtains the configuration information of the sidestream communication resource pool,

the receiving user equipment determines the duration of a round trip timer for discontinuous reception of sidestream communications.

9. The method performed by the user equipment of claim 8,

the configuration information of the sidestream communication resource pool at least comprises a minimum time domain interval sl-MinTimeGapPSFCH between the PSSCH and the PSFCH, and a Period sl-PSFCH-Period of the PSFCH.

10. A user equipment, comprising:

a processor; and

a memory storing instructions;

wherein the instructions, when executed by the processor, perform the method of any of claims 1 to 9.